Buggy toggle "Disable when using Google Chrome" option

Well, I switched on the aforementioned option to see what happened and, indeed, f.lux stopped working when Chrome had the focus. The problem is, after I switched on the option, it dissapeared, so for a while I couldn't switch it off. After closing and reopening both f.lux and chrome, the option showed again, toggled on, so I deactivated it, but the behavior seems to be a little annoying.

It disappeared because Chrome wasn't the last thing in focus before you opened the f.lux menu. It does this so that you can have more than just one thing disabled. So, the last thing in focus before you open the menu is what you will be configuring.